Actually, it's quite possible.
edit 2
Found it!
First, you'll need lazy game editor( found here)
http://www.download.com/LazyGame-Memory-Editor/3000-2121_4-10386322.html?tag=lst-0-1Now, install the program, set task to ff7.exe, add an address and edit it to
00dc0ddc, set the value to 0, and ff7 will have all party members unlocked, so you can take them in and out of your party in the PHS menu!
I was able to figure this out when I discovered that if you take a table of known addresses for another mem editor I used long ago (check the ff7 tables in
www.gamehack.com ), each address will exactly corrospond to a an address in lazy game editor, offset by a certain value (add EA18 to the origional gamehshark address with the calculator included in windows (in hex))
example
Code for unlocking all party members in gamehack
00db23c4 value = 0
add EA18 with to the address and you get the address in lazy game editor!
00dc0ddc valude = 0 !
I've only tested this with a few known addresses, but it works perfectly so far. This should be able to solve your problem sir! I love discovery : )